Objective: Cognitive-behavioral therapy (CBT) protocols for each of the anxiety disorders are robust and effective but are best suited for specialty clinics. This study assessed a format more suitable for general clinics: a single protocol based on standard CBT techniques designed to treat patients who have different anxiety disorders in the same group. Methods: Potential participants in Vancouver, British Columbia, were administered a structured clinical interview to identify those with major anxiety disorders: panic disorder, with or without agoraphobia; obsessive-compulsive disorder; social phobia; generalized anxiety disorder; specific phobia; and posttraumatic stress disorder. Forty-three percent of participants had more than one current anxiety diagnosis. Those with active substance abuse or dependence or with psychosis were excluded. A total of 152 patients were randomly assigned to immediate treatment in the 11-week CBT group or to a wait-list control group. The Beck Anxiety Inventory (BAI) was administered at baseline, at the end of treatment or of the waiting period, and six months later.

Results: Reductions in BAI scores for participants in the immediate-treatment groups were greater than those for the control group participants. Patients with panic disorder in particular appeared to benefit. Outcomes for the immediate-treatment group were superior in terms of clinically significant changes, defined as a 20% or 40% improvement. Reductions in BAI scores continued to be present six months later. The improvements correspond to a medium effect size (Cohen’sd=. 50). Conclusions: A group CBT protocol for mixed anxiety disorders may make effective treatment more widely available.(Psychiatric Services 58: 1205–1211, 2007)